SU690323A1 - Method of regulating the frequency of frequncy-output pressure gauges - Google Patents

Description

. The invention relates to a measuring technique and can be used to control the output frequency of the frequency pressure sensors. The closest in technical terms to the invention is a method of controlling the frequency of frequency pressure sensors, which consists in determining the frequency of the resonator oscillations with the help of a piston and a sleeve in the absence and presence of measured pressure and determine the sensitivity of the sensor when zero to the measured value. However, the known method is characterized by low control accuracy, since the selection of parts is carried out from a large amount, and all of them differ in their mass within a wide range. The purpose of the invention is to follow the exact type of regulation. This goal is achieved by determining the oscillation frequency of the resonator with the help of standard pistons and bushings, comparing the obtained sensor sensitivity values with its predetermined value and determining the sensor sensitivity by calculating the sizes of the piston and bush. The method is carried out in the following manner. The frequency of oscillation of the resonator (using a piston and a sleeve in the absence and presence of a measured pressure P) and the sensitivity F of the sensor when the pressure P varies from zero to the measured value are determined. The resonator oscillation frequency f is calculated using reference pistons and bushings, the obtained sensitivity value F of the sensor is compared with its predetermined value, and the sensor sensitivity F is obtained by calculating the sizes of the piston and sleeve. The frequency of oscillation of the resonator f under the action of pressure P is deflated by the formula

but

de f - oscillation frequency

at Р О; -,

K - constructive). The +, - signs correspond to the expansion and contraction of the resonator inherently. -. -. .

The pressure P in sensors with a piston and a sleeve is determined by the formula, kg:

 Xd

 J

de d - outer diameter of the piston.

The frequency I of the oscillations of the resonator, taking into account the outer diameter of porish, is equal to

yy

ff.

one ..

Frequency fwiM Oscillations of the rezioatbra with the reference piston and in the tulk at the measured pressure is equal to

J

2; ka „,

where is the outer diameter of the reference

pistons

The specified sensitivity of the RTS4m on the adjustable sensor is obtained at a measured pressure with the help of such a piston, the diameter is equal to)

, from and

t, (

where ck. - coefficient determined by. formula. , . .

3. 4

, - (Rizm / - (4.

I:

The diameter of the 3 holes in the sleeve is

3 „Ch13 2A),

where A is the radial clearance between the pori1 ni bushing.

The main advantage of the method is to increase the frequency control accuracy by accurately calculating the dimensions of the piston and sleeve.

Claims (1)

Invention Formula The method of controlling the frequency of frequency pressure sensors, which consists in determining the frequency of oscillations of the resonator using a piston and sleeve in the absence and presence of a measured pressures and determine sensitivity a sensor with a pressure change from zero to the measured value; This is due to the fact that, in order to control the accuracy of the regulation, the resonator's oscillation rate using reference pistons and bushings, compare the obtained value of the sensitivity of the sensor with the given value of it and the definition of the sensitivity of the sensor by  calculating the sizes of pistons and bushings. Sources of information taken into account in the examination I. Technical description of the sensor type TDG 31-OTU, 1976.